Abstract
Abstract. The utilization of geothermal reservoirs as alternative
energy source is becoming increasingly important worldwide. Through
close-range aerial photogrammetry realized by unmanned aircraft systems
(UAS), this study investigates the surface expression of a leaking warm
water reservoir in Waiwera, New Zealand, that has been known for many
centuries but remained little explored. Due to overproduction during the
1960s and 1970s the reservoir has suffered significant pressure reduction,
which resulted in the loss of artesian conditions and led to the desiccation
of the hot springs in close succession. However, shortly after the recent
shutdown of the primary user (Waiwera Thermal Resort & Spa) renewed
artesian activity was reported by locals but no hot spring activity has been
observed so far. Therefore, this study was carried out in October 2019 to
assess the actual conditions of thermal activity in the area of the former
hot springs. UAS with coupled thermal infrared cameras were used for thermal
mapping and the obtained data show renewed activity of the hot springs on
the beachfront of Waiwera. Faults and fractures were identified as important
fluid pathways, as well as individual fluid conducting lithologies.
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